Varieties of Land and Fluviatile Shells of Jamaica. 19 



with a well impressed suture on both sides ; but more so 

 on under side. Last whorl with an angular periphery 

 almost directly over the plane of the centre of the whorls, 

 inclining to the upper rather than to the lower side ; but 

 much less so than in H. vortex, and still less so than in PI. 

 Me Nabiana. Aperture very oblique, more so than in PL 

 vortex ; the lower half of the labrum being advanced 

 very far and abruptly beyond the upper half. 



Greatest breadth .45, least breadth .42, height of the last 

 whorl .07. 



Found near the head of the navigable part of the Black 

 River, fit. Elizabeth. 



